What exactly do they expect to find? Why not just ask her to undress in public (that's sarcasm, in case anyone thinks I'm being serious).

I once went through airport security and because the stupid machine bleeped I was frisked and had to place my tictacs and hanky in a container to be scanned which is just too stupid for words really...only to be informed, at a later date by someone who works as security there, that the machines automatically bleeps at every 5th person anyway.